Lock.



H. G. VOIGHT.

LOOK.

APPLICATION rum) mm: a, 1911.

1,004,506. Patentd Sept. 26,1911.

UNITED STATES PATENT OFFICE.

HENRY G. VOIGHT, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO RUSSELL & ERWIN MANUFACTURING COMPANY, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

LOCK.

To all whom it may concern- Be it known that I, HENRY G. V OIGHT, a citizen of the United States, residing at New Britain, Hartford county, State of Connecticut, have invented certain new and useful Improvements in Locks, of which the following is a full, clear, and exact description.

My invention relates to improvements in looks, the object being to provide a very simple means for permitting the holder of a proper key to advance the bolt so that the bolt cannot be withdrawn by the ordinary pass key.

I11 the drawings. Figure 1 is an elevation of the upper part of a lock, the cap being removed. Figs. 2 and 3 are similar views showing the parts in different positions. Fig. 4 is an end view partly in section on the line of the parts as shown in Fig. 1. Figs. 5 and 6 are views of two differentkeys. Fig. 7 is a view of a detail.

1 represents a lock case, 2 the face plate thereof, 3 the dead bolt. The dead bolt is provided with a rearwardly extending tailpiece carrying a fence 4:. The fence 4 is arranged to be controlled by the usual tumblers (not shown).

5 is what I will term a key'blocking slide. This slide is mounted to slide in the lock case. In this particular instance the slide is provided with three slots, as shown. Standing in the forward slot is a pin 6 carried by the lock case. Standing in the rearward slot is a pin 7 carried by the bolt 3.

8 is a pin carried by the case and standing in registering slots in the slide 5 and tail of the bolt 3, to act as a guide for said parts.

9 is what I will term the proprietors key or guard key.

10 is what I will term the ass key or guests key. The lower part of the slide 5 is provided with the usual notch 11 to receive the bitted end of the key 10, while the tail of the bolt is provided with a similar notch.

Operation: Starting with the parts as shown in Fig. 1, if the key 9 is used to advance the bolt 3, the same will be advanced as shown in Fig. 2, but it will be observed that in this advance of the bolt the slide 5 remains stationary. The result will be that should the holder of a key similar to Specification of Letters Patent.

Application filed June 8, 1911.

Patented Sept. 26, 1911. Serial No. 631,885.

the key 10 endeavor to retract the bolt. such effort would be unsuccessful, since the bitted end of the key (which is shown in this instance to be wider than the bitted end of the key 9) would hit against the under side of the slide 5. Hence, a door equipped with such a lock and locked by a key similar to cey 9, which we may assume is the proprietors key, would remain locked until. opened by the same or a duplicate key. Starting again with the parts as shown in Fig. 1, if the guest key 10 were employed to advance the bolt to the position shown in Fig. 3, said guest key would simultaneously advance the blocking slide 5 to the position shown in said Fig. 3, whereupon the door might be unlocked by the use of a similar key, or, indeed, by the use of a key similar to the proprietors key 9. Any suitable means may be provided to frictionally hold the slide 5 in position, for example, a friction spring 12 hearing in notches in the slide 5.

By this very simple expedient a door may be securely locked against admission by any key other than the special key, or a duplicate thereof, which may be held by the proprietor or one in authority. Such locks are useful in connection with hotels or public institutions having a large number of rooms provided with differently bitted keys. In such instances the proprietors key could be mastered to all the locks of the diflerent apartment.

I am aware that various modifications can be made Without departure from the spirit or scope of the following claims.

What I claim is:

1. In a look, a bolt, two differently bitted keys for operating said bolt, a slidable blocking device arranged when in one position to stand in the path of and block one of the keys against turning in a direction to retract the bolt, said key being constructed to encounter said blocking device, the other key being constructed to clear said blocking device when rotated.

2. In a look, a bolt arranged to be advanced and retracted by a key, a blocking slide arranged to be advanced and retracted by a key, both of said parts being notched, a key for advancing and retracting said slide and bolt simultaneously when said notches register and another key for advanc ing said bolt independently of said slide to move the notched parts thereof out of registry.

In a lock, a bolt having a tail piece, said tail piece having a notch therein, a slide arranged to reciprocate in line with the bolt and at one side thereof and having a notch therein, a key for simultaneously engaging both the bolt and the slide, and another key for engaging the bolt only.

4. In a look, a bolt having a tail piece, said tail piece having a notch therein, a slide arranged to reciprocate in line with the bolt and at one side thereof and having a notch therein, a key for simultaneously engaging both the bolt and the slide, and another key for engaging the bolt only, the first mentioned key operating said bolt and slide only when the notches therein register with each other, the second mentioned key operating said bolt under all conditions in either direction.

5. In a look, a bolt, a slide, keys for both of said parts whereby the same are movable to and fro in the same direction, said parts being relatively movable independently, a key to move both of said parts simultaneously in either direction when said parts occupy a certain position relatively to each other and being incapable of moving either of said parts When the same bear a different relation to each other, and another key for operating the bolt independently of the slide.

6. In a lock, a bolt, a slide, keys for both of said parts whereby the same are movable to and fro in the same direction, said parts being relatively movable independently, a key to move both of said parts simultaneously in either direction when said parts occupy a certain position relatively to each other and being incapable of moving either of said parts when the same bear a different relation to each other, and another key for operating the bolt independently of the slide under all conditions and in either direction.

HENRY G. VOIGHT.

Witnesses Gwrmnormn JACKSON, M. S. 'WIARD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

